What is the impact of electropolishing on the hardness and corrosion resistance of additive manufactured 17-4PH stainless steel?

Label:chem

Topic
Electropolishing is an electrochemical process that can improve the surface quality of metals by reducing surface roughness. This process can also affect the hardness and corrosion resistance of the material, which are important properties for applications in aerospace and other industries.

From: "Effect of phosphoric acid and perchloric acid on Electropolishing of additive manufactured 17-4 PH stainless steel and its characterization",
International Journal of Electrochemical Science, Volume 17, Issue 3, March 2022, 220315
Answer
Electropolishing increases the hardness of additive manufactured 17-4PH stainless steel compared to mechanically ground samples. The hardness of the sample after electropolishing with phosphoric acid and perchloric acid for 10 minutes is greater than that of a mechanically ground sample. Additionally, electropolishing enhances the corrosion resistance of the material. The impedance of the sample after electropolishing is greater than that of the untreated sample, with the absolute impedance at low frequency (0.01 Hz) increasing significantly after electropolishing. For example, the absolute impedance for electropolishing using perchloric acid for 10 minutes is 10 times that of the untreated sample.
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